pub enum TransferProtocol {
    WebSocket,
    Bluetooth,
    WiFiDirect,
    USB,
}

pub async fn start_transfer(
    protocol: TransferProtocol,
    file_path: PathBuf,
    connection_code: Option<String>,
) {
    match protocol {
        WebSocket => ws_transfer(file_path, connection_code.unwrap()).await,
        Bluetooth => bluetooth_transfer(file_path).await,
        // ... 其他协议
    }
}

async fn ws_transfer(file_path: PathBuf, code: String) {
    // 实现WebSocket文件传输
}